Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1989-06-09
1990-10-23
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With particular transmitter
307310, 307304, 328 3, G08C 1906
Patent
active
049655477
ABSTRACT:
A circuit which converts one parameter to another such as from temperature to electricity. The circuit comprises a three winding differential transformer with one winding connected to output terminals and each end of the other windings connected to a source (or drain) of a different one of four field effect transistors. The circuit is adapted for receiving an alternating current source to be coupled between drains (or sources) of the transistors connected to one end of each winding and the drains (or sources) of the other transistors. A temperature measuring device and reference temperature measuring device are connected to respective ones of two of the transistors to set the current limits of the transistors as a function of temperature. A voltage produced at the output terminals, when the alternating current source is applied, is proportional to the difference in temperature of the temperature measuring devices.
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R. C. Jaeger, "Temperature Sensor", 9/79, pp. 1346-1347, IBM Technical Disclosure Bulletin.
General Electric Company
Lau Yuk H.
Smiley Raymond E.
Yusko Donald J.
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